Ironic, I'd like a tank without it but, alas, my 90 gallon does have that and hair algae. I'm slowly winning though. Phos = 0 but Nitrates are my problem and flow could be better.
Are you still looking for a tank with cyano? my BC 29 has it pretty good. Been fighting it for a while. Increased the flow, water changes every other day, 3 days darkness, cut down on feeding. seems to get worse..